Soot blower



imm 2l, 3936. A, RSSNER I 2,028,259

SOOT BLOWER l Filed May 1, 1933 n 3 Sheets-Sheet l f l 7 l 11 5 l /f 9 v5f: s a 4 linie /f y; EIZW TORNEY J. 21, 1936. A. RSSNER 2,028,250

SOOT BLOWER Filed May l, 1933 5 Sheets-Shen 2 INVENTOR ATTORNEY PatentedJan. 21, `12936 UNITED STATES PATENT oFFlcE Ruths InternationalAccumulators Limited,

London, England, a corporation of Great Britain Application May 1,1933,` Serial No. 668,6791/2 v In Germany December 1, 1932 4 Claims.

My invention relates to a sootblower-apparatus for j:the cleaning of theheating surfaces of boilers, superheaters, economizers and the like. Itsefliciency is superior to that of the welllknown systems of this kind,because the: nozzles heating surface in such a Way that the soot whichhas been deposited on the foremost row of tubes is whirled off, whereasthe jet, broken and reflected by the rst tubes, does not reach the sooton" the tubes situated behind the first row. Furthermore, the knownsootblower-systems are equipped with movable or turnable parts, whichare complicated, expensive and exposed to destruction by the hightemperature of the flue gases.

According to the invention the nozzles may be installed entirely insidethe brickwork oi the boilers and slits may be arranged in the brickwork,through which the jet is blown into the furnace.

With boilers, economizers and the like it is advisable to install thenozzles in the vertical brickwork of the side walls so that they blow atright angles to thedirection of the flue gases.

A remarkably simple means to cool the nozzles can be obtained by naturaldraught if the nozzles are arranged inside a channel or tube, the openends of which lie at different heights, so that the cooling air canenter at the lower end and leave the channel or tube at the upper end.

It is advisable to divide the nozzles into groups, each of which isconnected to a separate distribution pipe, to which the steam or the airis supplied'by a pipe-line with a separate stopvalve. In this Way thepressure in the supply pipe is better utilized and the jets better reachthe different parts of the surfaces. The distribution pipes may bearranged inside the air- T cooling tubes, so that they will be cooledalso.

Fig. 1 is a vertical sectional View of a portion of a boiler embodyingmy invention;

Fig. 2 is a more or less diagrammatic illustration oi my inventionembodied in an economizer;

Fig. 3 is a crosssectional view of a preferred form of nozzle;

Fig. 4 is a cross-sectional view of the nozzle shown in Fig. 3 and takenat right angles thereto;

Vits upper end 'I.

Fig. 5 is a top view of the nozzle shown in Figs. 3 and 4; y

Fig. 6 is a cross-sectional view of a modified form of nozzle;

Fig. 7 is a sectional View of a portiony of a boiler having water cooledwalls and embodying my invention;

Fig. 8 is a view of the boiler shown-in Fig. 7 looking from the left;

Fig. 9 is a cross-sectional view of a further modified form of nozzle;and

Fig. 10 isa sectional view of my invention embodied in a furnace havingwater cooled walls.

Referring to the drawings, Fig. l represents a vertical section througha part of a boiler in which different forms of `nozzles are shown. It isto be assumed that the direction of flow of the nue-gases in thedrawings is from the topto the bottom. In the vertical side wall Vat theright is installed the blower element I with four nozzles 2 and anotherblower element 3 with 4two nozzles 2. The nozzles are arranged inside acooling tube or conduit il, which is surrounded by heat insulatingmaterial 5, which protects as well the distribution pipes I and 3. Theconduit fl and the pipes I and 3 are embedded in the insulatingmaterial. The cooling air enters the tube at the lower opening 6and-leaves it at At the outlets of the nozzles i. slits are arranged inthe brickwork through which the jets are directed along the boiler tubes9 to clean these from the soot deposits Ill. Due to the fact that thenozzles are set back in the furnace walls, they are removed a certaindistance from even the closest tubes. Consequently the jets have anopportunity to spread out before reaching the closest tubes Vand hencethe nozzles may be spread further apart.

In the vertical side wall on the =leit an uncooled blower element IIwith 4 nozzles is in- 40 stalled in the upper part. In the lower part ablower element l2 with three nozzles is arranged inside a channel of thebrickwork. This channel is arranged so that the air enters at 28 andleaves the channel at 29. With this arrangement the distribution pipe I2is cooled also.

Fig. 1 shows especially the effectiveness ofthe soot -blower system. Thesoot is vdeposited chiefly on those parts of the tubes I0 which are nottangent to the flue gas stream, that is, as seen in the direction of theflue gas stream, the front and the back sides of the boiler tubes. Asthe blowers project the jets from the side walls at right angles to theflue gas stream into the space between the different rows of tubes, the

jets chiefly touch those parts of the tubes on which the soot is mostlikely to be deposited.

Fig. 2 represents the arrangement or" the nozzles for an economizer. Inthese drawings the ilue gas stream is again assumed to iiow downwards.Nozzles I6 and Il are staggered with respect to nozzles I8 and i9. Thesoot deposited on the tubes 2D is blown oli by the nozzles I6 and Il onthe one side and nozzles i8 and ISon the other side, which are arrangedin alignment with the spaces between the tubes. zles thus blow at rightangles to the ilue gas stream. The soot which is thus removed from thetubes is then carried downwardly through the vertical spaces of theeconomizer into the ash pit. This is done by the jets from nozzles i4and I5 which are so arranged that they blow in the direction of the uegas stream.

Figures 3 to 5 show an example of the design of a nozzle. Figures 3 andl are vertical sections, Fig. 5 shows the nozzle seen from above. Thenozzle body 2l is equipped with cooling ribs 22 and near the outlet witha flange 23 having a larger diameter than that of the cooling ribs. Thisflange rests on the brickwork and thus prevents air leakage. The nozzleends in a curved slit 25. The walls of the nozzle adjacent to slit 24 onboth sides areared outwardly as is shown at 26. VIn this way contractionof the jet is prevented and a ilat fanlike jet is produced.

Fig. 6 shows another example of the design in whichl nozzle 28 isscrewed on to a socket 253 fitted with a thread in order that the nozzlecan be adjusted. Socket 29 is welded to the distribution pipe which isnot shown on the drawings. During the erection the nozzle can thus be soadjusted that the jet assumes the desired position relatively to theheating. surface to be cleaned. As is shown in Figure 9, instead ofconnection by a thread the nozzle 2S can be slipped on to the socket,for instance on a coneshaped nipple 42, and then welded to the socket,as at 43, after being adjusted to the right position.

Figs. '7 and 8 show the arrangement of a sootblower for the water tubesof a boiler having water cooled walls. The water tubes 3@ and 3| areconnected to the lower headers 32 and 33.

In the lower brickwork 34 the nozzle 35 is so installed in a tube 36that it .blows through the slit 31 along the rows of tubes Sil and 3l.That wall of the' slit 37 which is situated toward the furnace is formedby a specially shaped re brick 38.

As is shown in Fig. 10, the nozzles 49 may be installed in the cornersof a side wall of the boiler so that they project jets along the tubes4I of an adjacent water cooled side wall in the diagonal direction ofthe side wall.

I wish it to be understood that I do not wish to be limited to the exactdetails of my invention as shown and described for obvious modicationswill occur to a person skilled in the art.

What I claim is:-

1. In a device of the class described, means comprising a wall ofheat-resisting material forming a heating chamber, tubes within saidchamber, a conduit extending within said wall and having its open endsin communication with the atmosphere outside said chamber at differentelevations, said wall and said conduit being formed with narrow alignedslits extending from These nozsaid conduit to said chamber and directedtoward said tubes, nozzles located within said conduit in alignment withsaid slits so as to project jets of iiuid therethrough and against saidtubes, a distributing pipe for supplying iluid under pressure to saidnozzles, and heat insulating material surrounding and embedding saidconduit and said distributing pipe, said insulating material beingformed with narrow slits in alignment with the slits in said wall andsaid conduit.

2. In a device of the class described, means comprising a wall ofheat-resisting material forming a heating chamber, tubes within saidchamber, said wall being formed with a substantially closed hollowportion and with narrow slits communicating with said hollow portion andwith said chamber and directed toward said tubes, nozzles located withinsaid hollow portion so as. to be protected from heat within saidchamber, said wall being formed with passageways extending from saidhollow portion to the outside of the wall whereby atmospheric aircirculates through said hollow portion to col said nozzles, and meansfor supplying fluid under pressure to said nozzles, said nozzles beingin alignment with said slits so as to project a jet of iluidtherethrough and against said tubes and the ends of said nozzles beingin contact with the wall adjacent to the ends of said slits to preventthe ilow of air into said heating chamber.

' 3. In a device of the class described, means comprising a wall ofheat-resisting material forming a heating chamber, tubes within saidchamber, a conduit extending within said wall and having its open endsin communication with the atmosphere outside said chamber, said wall andsaid conduit being formed with narrow aligned slits extending from saidconduit to said chamber and directed toward said tubes, nozzles locatedwithin said conduit in alignment with said slits so as to project jetsof fluid therethrough and against said tubes, a distributing pipe forsupplying fluid under pressure to said nozzles, and heat insulatingmaterial surrounding and embedding said conduit and said distributingpipe, said insulating material being formed with narrow slits inalignment with the slits in said Wall and said conduit, and the ends ofsaid nozzles being in contact with said conduit adjacent to the innerends of the slits therethrough to prevent the ow of air into saidheating chamber.

4. In a device of the class described, means comprising a Wall ofheat-resisting material forming a heating chamber, tubes within saidchamber, a conduit extending within said wall and having its open endsin communication with the atmosphere outside said chamber, said wall andsaid conduit being formed with narrow aligned slits extending from saidconduit to said chamber and directed toward said tubes, nozzles locatedwithin said conduit in alignment with said slits so as to project jetsof fluid therethrough and against said tubes, a distributing pipe forsupplying iluid under pressure to said nozzles, and heat insulatingmaterial surrounding and embedding said conduit and said distributingvpipe, said insulating material being formed with narrow slits inalignment with the slits in said wall and said conduit.

ALOIS RSSNER.

